The black and white clip is allegedly part of a much larger collection of footage that was filmed by government agents working on top secret UFO and alien matters between the years 1942 and 1969. Only a fraction of the much longer 180 minute archive of footage has been released thus so far.
The people or person who leaked the footage alleges to have done so anonymously as a precaution to ensure their safety. The alien seen in the video is clearly humanoid and is said to originate from the nearby Zeta Reticuli star system. As can be seen he is wearing the tight fitting space suit so commonly described by those who have experienced close encounters with aliens